Gwyddion – Free SPM (AFM, SNOM/NSOM, STM, MFM, …) data analysis software

hough (HEAD)

hough — Hough transform

Functions

void gwy_data_field_hough_line ()
void gwy_data_field_hough_circle ()
void gwy_data_field_hough_line_strenghten ()
void gwy_data_field_hough_circle_strenghten ()
gint gwy_data_field_get_local_maxima_list ()
void gwy_data_field_hough_polar_line_to_datafield ()
void gwy_data_field_hough_datafield_line_to_polar ()

Includes

#include <libprocess/gwyprocess.h>

Description

Functions

gwy_data_field_hough_line ()

void
gwy_data_field_hough_line (GwyDataField *dfield,
                           GwyDataField *x_gradient,
                           GwyDataField *y_gradient,
                           GwyDataField *result,
                           gint hwidth,
                           gboolean overlapping);

gwy_data_field_hough_circle ()

void
gwy_data_field_hough_circle (GwyDataField *dfield,
                             GwyDataField *x_gradient,
                             GwyDataField *y_gradient,
                             GwyDataField *result,
                             gdouble radius);

gwy_data_field_hough_line_strenghten ()

void
gwy_data_field_hough_line_strenghten (GwyDataField *dfield,
                                      GwyDataField *x_gradient,
                                      GwyDataField *y_gradient,
                                      gint hwidth,
                                      gdouble threshold);

gwy_data_field_hough_circle_strenghten ()

void
gwy_data_field_hough_circle_strenghten
                               (GwyDataField *dfield,
                                GwyDataField *x_gradient,
                                GwyDataField *y_gradient,
                                gdouble radius,
                                gdouble threshold);

gwy_data_field_get_local_maxima_list ()

gint
gwy_data_field_get_local_maxima_list (GwyDataField *dfield,
                                      gdouble *xdata,
                                      gdouble *ydata,
                                      gdouble *zdata,
                                      gint ndata,
                                      gint skip,
                                      gdouble threshold,
                                      gboolean subpixel);

Locates local maxima in a data field.

At most ndata maxima are located.

Parameters

dfield

A two-dimensional data field.

 

xdata

Array of ndata elements where the columns should be stored.

 

ydata

Array of ndata elements where the rows should be stored.

 

zdata

Array of ndata elements where the values should be stored.

 

ndata

Number of items in xdata , ydata and zdata .

 

skip

Minimum pixel distance between maxima.

 

threshold

Minimum value to be considered a maximum.

 

subpixel

TRUE for subpixel refinement.

 

Returns

The actual number of maxima found.

gwy_data_field_hough_polar_line_to_datafield ()

void
gwy_data_field_hough_polar_line_to_datafield
                               (GwyDataField *dfield,
                                gdouble rho,
                                gdouble theta,
                                gint *px1,
                                gint *px2,
                                gint *py1,
                                gint *py2);

gwy_data_field_hough_datafield_line_to_polar ()

void
gwy_data_field_hough_datafield_line_to_polar
                               (gint px1,
                                gint px2,
                                gint py1,
                                gint py2,
                                gdouble *rho,
                                gdouble *theta);
© David Nečas and Petr Klapetek

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